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diff --git a/toys/posix/nice.c b/toys/posix/nice.c
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+/* vi: set sw=4 ts=4:
+ *
+ * nice.c - Run a program at a different niceness level.
+ *
+ * Copyright 2010 Rob Landley <rob@landley.net>
+ *
+ * See http://www.opengroup.org/onlinepubs/9699919799/utilities/nice.html
+
+USE_NICE(NEWTOY(nice, "^<1n#", TOYFLAG_USR|TOYFLAG_BIN))
+
+config NICE
+	bool "nice"
+	default y
+	help
+	  usage: nice [-n PRIORITY] command [args...]
+
+	  Run a command line at an increased or decreased scheduling priority.
+
+	  Higher numbers make a program yield more CPU time, from -20 (highest
+	  priority) to 19 (lowest).  By default processes inherit their parent's
+	  niceness (usually 0).  By default this command adds 10 to the parent's
+	  priority.  Only root can set a negative niceness level.
+*/
+
+#include "toys.h"
+
+DEFINE_GLOBALS(
+	long priority;
+)
+
+#define TT this.nice
+
+void nice_main(void)
+{
+	if (!toys.optflags) TT.priority = 10;
+
+	errno = 0;
+	if (nice(TT.priority)==-1 && errno) perror_exit("Can't set priority");
+
+	xexec(toys.optargs);
+}